rift

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rift

1
Geology a long narrow zone of faulting resulting from tensional stress in the earth's crust

rift

2 US
1. a shallow or rocky part in a stream
2. the backwash from a wave that has just broken

Rift

 

a major linear tectonic structure of the earth’s crust hundreds and thousands of kilometers long that forms when the crust is horizontally extended; this process usually occurs where there is a vast arching uplift. It is believed that the entire thickness or a significant part of the thickness of the earth’s crust is being extended.

A rift consists mainly of a series of fractures, among which faults with inclined surfaces predominate; the crustal sector lying above the surface of a fault is also dislocated downward. The sum of the horizontal components of all such shifts compensates for the horizontal extension of the crust. The dip of a fault is usually 60°-70°, and the vertical amplitude of the shift along a fault may reach 5 km. The crustal extension can be several kilometers, and in some cases, several tens of kilometers long.

Various types of grabens and horsts are found within a rift. The graben is the chief structural form. A rift usually begins to form, however, with a gentle upward bend of the crust in the form of a tectonic arch; the arch later breaks up and separates into grabens and horsts. Very large rifts are called rift zones or systems.

V. V. BELOUSOV

rift

[rift]
(geology)
A narrow opening in a rock caused by cracking or splitting.
A high, narrow passage in a cave.

rift

The direction in which stone splits most readily; characteristic of granite or other stone not having visible stratification or foliation.
References in periodicals archive ?
A[cedilla] Pakasuchus kapilimai -- mammal-like crocodile, Rukwa Rift Basin
Milankovitch cycles in Early Mesozoic rift basins of Eastern North America provide physical stratigraphy and time scale for understanding basin evolution: Lamont (Newsletter), 13, pp.
As Rift Basin International has failed to fulfill its farmin obligations despite several extensions to the completion date the agreement was terminated.
'What this study shows is that this ancient rift basin, and the others discovered under the ice that connect to the warming ocean, can influence contemporary ice flow and may exacerbate ice losses by steering coastal changes further inland,' said co-author Fausto Ferraccioli of the BAS.
Lawrence Rift to the modern East African Rift, and, indeed, the graben in fill of Lake Timiskaming is similar to that in other rift basins worldwide (e.g.
We now look forward to signing the farm down agreements with CNOOC (Chinese National Oil Offshore Corporation) and Total in the coming weeks and commence work with them on an accelerated basin-wide development plan that is expected to deliver production well in excess of 200,000 bopd from the Albert Rift Basin.
After continued stretching for 5 to 10 million years has produced a rift basin some 200 kilometers wide, the shallow and deep sources of mantle partial melts become horizontally separated.
The study highlights the importance of rift orientation relative to extension direction as key factor deciding whether an ocean basin opens or an aborted rift basin forms in the continental interior.
East Africa's third-largest economy struck hydrocarbon deposits in the Albertine rift basin but commercial production has been delayed and is not expected until 2016 at the earliest.
Tullow Oil's Exploration Director, Angus McCoss, said in relation to the development: "A fifth consecutive oil discovery onshore Northern Kenya highlights the emerging world class exploration and production potential within our rift basin acreage.